Jensen, R. J., Wagner, S., & National Council of Teachers of Mathematics. Research Interpretation Project. (1993). Research ideas for classroom: Early childhood mathematics. Macmillan.
Cita Chicago (17th ed.)Jensen, Robert J., Sigrid Wagner, i National Council of Teachers of Mathematics. Research Interpretation Project. Research Ideas for Classroom: Early Childhood Mathematics. New York: Macmillan, 1993.
Cita MLA (9th ed.)Jensen, Robert J., et al. Research Ideas for Classroom: Early Childhood Mathematics. Macmillan, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.